Abstract
We experimentally demonstrate simultaneous turbulence mitigation and channel demultiplexing in a 200 Gbit/s orbital-angular-momentum (OAM) multiplexed link by adaptive wavefront shaping and diffusing (WSD) the light beams. Different realizations of two emulated turbulence strengths (the Fried parameter r(0) = 0.4, 1.0 mm) are mitigated. The experimental results show the following. (1) Crosstalk between OAM l = +1 and l = -1 modes can be reduced by >10.0 and >5.8 dB, respectively, under the weaker turbulence (r(0) = 1.0 mm); crosstalk is further improved by >17.7 and >19.4 dB, respectively, under most realizations in the stronger turbulence (r(0) = 0.4 mm). (2) The optical signal-to-noise ratio penalties for the bit error rate performance are measured to be similar to 0.7 and similar to 1.6 dB under weaker turbulence, while measured to be similar to 3.2 and similar to 1.8 dB under stronger turbulence for OAM l = +1 and l = -1 mode, respectively. (C) 2020 Optical Society of America